NuGet add reference error while installing packages

Question

I am not able to install any package by Nuget. For example when I want install entity framework I receive following error:

install-package EntityFramework
Successfully installed 'EntityFramework 4.2.0.0'.
Successfully uninstalled 'EntityFramework 4.2.0.0'.
Install failed. Rolling back...
Install-Package : Failed to add reference to 'EntityFramework'.
At line:1 char:16
+ install-package <<<<  EntityFramework
   + CategoryInfo          : NotSpecified: (:) [Install-Package], InvalidOperationException
   +FullyQualifiedErrorId:NuGetCmdletUnhandledException,NuGet.PowerShell.Commands.InstallPackageCommand

I receive same error while installing every package from console or gui. Reinstalling nuget, disabling other extentions and running VS as admin did not help me.

Regards

@DimaPasko: no not readonly I can manually add reference, nuget cant do. I create new project but I get same error. — Sam FarajpourGhamari
– Sam FarajpourGhamari, Commented Nov 29, 2011 at 17:16
Have you tried another NuGet package? What is project type? Class Library? — Dima Pasko
– Dima Pasko, Commented Nov 30, 2011 at 9:28

marvc1 · Accepted Answer · 2012-10-26 15:00:56Z

82

I had this problem too, the fix that worked for me was:

Delete all the folders inside of the packages folder.
Update all packages in Nuget Package Manager.

answered Oct 26, 2012 at 15:00

marvc1

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5 Comments

Pete Montgomery Over a year ago

Must be a bug in Nuget

Ron Over a year ago

Just deleting the EF folder in the packages folder will suffice.

marvc1 Over a year ago

@Ron, if 'enable package restore' is set up for that project.

Steve Byrne Over a year ago

Clearing the packages cache worked for me, under tools --> nuget manager -- Manage packager settings --> clear cache

Yuval Perelman Over a year ago

I was struggling with it all day, tried everything. I thank you from the bottom of my heart

Artur Michajluk · Accepted Answer · 2015-05-07 19:34:23Z

7

Suffer the same. In the end it occurs that in

Tools -> Options -> Nuget Package Manager -> Package Sources

nuget.org was unchecked. Checking it solve the problem.

answered May 7, 2015 at 19:34

Artur Michajluk

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Comments

Dragos Durlut · Accepted Answer · 2015-06-11 11:23:07Z

7

Here is what solved it for me: VS2012 with EF6

I found my answer here: http://richardschneider.net/blog/wordpress/?p=21

From the VS command prompt, run the following command:

regsvr32 "C:\Program Files (x86)\Common Files\microsoft shared\MSEnv\VsLangproj.olb"

After that, go to Package manager console and run the following:

Install-Package EntityFramework -Version 6.1.3

answered Jun 11, 2015 at 11:23

Dragos Durlut

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2 Comments

Pétur Ingi Egilsson Over a year ago

In addition to this, I deleted Entity Framework from ./packages then ran the package manager command. Works.

Joe Johnston Over a year ago

I closed studio. Ran the command and restarted studio for success.

Jason Parker · Accepted Answer · 2012-05-17 18:45:46Z

5

I ran into this issue as well. Unfortunately, the only solution that worked for me was completely uninstalling Visual Studio, deleting any folders left over after the uninstall, rebooting computer, and then re-installing Visual Studio.

Visual Studio 'repair' did not work for me. Only complete re-install.

answered May 17, 2012 at 18:45

Jason Parker

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Luis Tellez · Accepted Answer · 2013-03-25 21:40:23Z

5

I had this problem too what i did was type in the package manager console Uninstall-Package EntityFramework -force, then delete the EntityFramework Folder in Package Folder, and then install it again Install-Package EntityFramework

answered Mar 25, 2013 at 21:40

Luis Tellez

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karthikr · Accepted Answer · 2014-10-09 19:04:07Z

3

by clearing package Cache the problem resolved:

Tools->package Manager->Package Manager Settings-> Clear Package Cache

edited Oct 9, 2014 at 19:04

karthikr

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answered Oct 9, 2014 at 18:58

ideaz

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1 Comment

Florin Vîrdol Over a year ago

I don't find the option "Clear Package Cache".

Enzo Apollonio · Accepted Answer · 2016-04-24 15:24:27Z

2

After updating my Visual Studio 2015 nuget stopped working.

After reading the posted solutions I founded that's a know bug, see http://blog.nuget.org/20150226/nuget-3.0-beta2.html

From Visual Studio I unistalled nuget extension, closed visual studio , downloaded and installed latest nuget version from https://dist.nuget.org/index.html

It worked

answered Apr 24, 2016 at 15:24

Enzo Apollonio

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Comments

Nabin · Accepted Answer · 2014-09-21 03:33:00Z

1

I ran into the same problem. I did the following:

update-package jQuery.

Install-Package Twitter.Bootstrap -Version 3.0.0

It worked , probably because the Bootstrap -version 3.0.0 work with the JQuery most recent version.

edited Sep 21, 2014 at 3:33

Nabin

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answered Sep 21, 2014 at 2:31

Gul Saeed

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Kijana Woodard · Accepted Answer · 2014-10-10 18:39:32Z

1

For me, the problem was fixed with git clean -dfx.

answered Oct 10, 2014 at 18:39

Kijana Woodard

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vanandsh · Accepted Answer · 2015-08-18 05:11:28Z

1

Running this command from an elevated prompt resolved my issue:

regsvr32 "C:\Program Files (x86)\Common Files\microsoft shared\MSEnv\VsLangproj.olb"

Source: https://docs.nuget.org/Release-Notes/Known-Issues

answered Aug 18, 2015 at 5:11

vanandsh

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Ogglas · Accepted Answer · 2015-10-19 12:52:36Z

1

Had nearly the same problem on my Windows 10 machine and could't figure out why no references worked in Visual Studio 2015 after running "Get Latest Version" in TFS and why I could not restore NuGet packages. For some reason NuGet added two packages folders to the computer and I had only deleted the package folder in the project:

Locations:

C:\Users\YourUser\Documents\Visual Studio 2015\Projects\YourProject\packages C:\Users\YourUser.nuget\packages

When both of the packages folders were removed I could restore NuGet packages and everything worked again.

answered Oct 19, 2015 at 12:52

Ogglas

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Comments

Nick Josevski · Accepted Answer · 2016-10-01 12:39:40Z

1

When I went to Visual Studio 2015 Update 3, it broke for me, I tried many of the steps, in other answers to clear package folders / caches / etc.

In the end I got it working via:

Full uninstall.
Went looking for all files/locations of visual studio (AppData/Documents/etc).
New re-install, it still didn't work (I had missed files in other locations).
Ran devenv commands : like /resetuserdata and /resetsettings
Ran a repair action.

So just note doing a full uninstall won't clear out all your settings/cache data.

answered Oct 1, 2016 at 12:39

Nick Josevski

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Manoz · Accepted Answer · 2014-03-27 11:45:13Z

0

The problem occurred in my entity framework version. I was using an older version of entity framework, After deleting older version of EF and re installing it with the latest version available helped me solving this issue.

answered Mar 27, 2014 at 11:45

Manoz

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Pooran · Accepted Answer · 2015-11-26 22:52:39Z

0

I deleted the project, created fresh one, first added entity framework reference. it worked.. moved necessary code back into the project

answered Nov 26, 2015 at 22:52

Pooran

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Simpa · Accepted Answer · 2016-08-17 16:04:27Z

0

In my case, deleting all occurrences of 'EntityFramework...' files in the Bin folder (open the folder in Windows Explorer) worked form me. I didn't have the packages folder in my project. The 'EntityFramework...' files were added by different action.

NOTE: You may need to rebuild project to remove error(s).

answered Aug 17, 2016 at 16:04

Simpa

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Doan Vu · Accepted Answer · 2016-12-21 02:52:06Z

0

I also ran into this case when installing the AttributeRouting package. After googling a while, i tried the following steps and it works for me:

Tools > Extensions and Updates: uninstall NuGet Package Manager and reinstall it. Restart the Visual Studio.
Tools > Options > Package Manager > Package Sources: make sure to check for the nuget.org source.

Hope this help.

answered Dec 21, 2016 at 2:52

Doan Vu

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Marconline · Accepted Answer · 2017-03-09 08:54:01Z

0

In my case, specifying the desidered version has solved the problem. That's probably because different projects in the same solution reference different version of the same Package. In that case, Nuget doesn't know the desidered version, hence the exception.

Just use this syntax:

Install-Package XXXX -Version A.B.C.D

answered Mar 9, 2017 at 8:54

Marconline

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Comments

Chris Payne · Accepted Answer · 2019-03-01 19:22:44Z

I had this problem in Visual Studio 2017 in Windows 10.

I had an existing project, and I updated the .Net Framework from 4.6.2 to 4.7.2, and the Entity Framework from 6.1.3 to 6.2.0. I rebuilt and deployed the application, but it failed to connect to my database because the reference to EntityFramework.SqlServer was broken.

I used the Package Manager UI to remove the Entity Framework from both projects in my solution. I attempted to re-add the Entity Framework, but it failed every time. I had to remove the Entity Framework from both projects and save the solution to source control (TFS), and then add the Entity Framework back in.

This successfully added the Entity Framework and the EntityFramework.SqlServer reference.

Prashant · Accepted Answer · 2019-10-21 19:14:09Z

0

Add new Source with following path and Tick it. https://www.nuget.org/api/v2/curated-feeds/microsoftdotnet/

answered Oct 21, 2019 at 19:14

Prashant

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Abdelrahman ELGAMAL · Accepted Answer · 2020-09-14 20:42:13Z

0

Tools -> NuGet Package Manager -> Package Manager Settings -> go to Package Sources and remove the source that is generating the problem.

answered Sep 14, 2020 at 20:42

Abdelrahman ELGAMAL

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